/*
 * Created on 28-Mar-2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.util;

import org.gudy.azureus2.core3.internat.MessageText;
import org.gudy.azureus2.core3.util.ByteFormatter;
import org.gudy.azureus2.core3.util.RandomUtils;

public class UUIDGenerator {
    /**
     * 128 bit UUID using random method
     * 
     * @return
     */

    public static synchronized byte[] generateUUID() {
        byte[] bytes = new byte[16];

        RandomUtils.SECURE_RANDOM.nextBytes(bytes);

        return (bytes);
    }

    /**
     * 129 byte random UUID formatted as standard 36 char hex and hyphen string
     * 
     * @return
     */

    public static String generateUUIDString() {
        byte[] bytes = generateUUID();

        String res = ByteFormatter.encodeString(bytes).toLowerCase(MessageText.LOCALE_ENGLISH);

        return (res.substring(0, 8) + "-" + res.substring(8, 12) + "-" + res.substring(12, 16) + "-" + res.substring(16, 20) + "-" + res
                .substring(20));
    }

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            System.out.println(generateUUIDString());
        }
    }
}
